Sleep training for naps

I recommend getting their night sleep in order first using one of the strategies you learned in this course. Once they are sleeping better at night, naps come easier.
In the meantime, you can handle napping the same way you always have. 

While this may deliver a bit of a mixed signal, if your child needs that daytime sleep, I want them to get it. This is especially true if the process of improving night sleep is challenging and they may be missing some sleep at night.

Once you're ready to work on naps, camping In typically doesn't work very well because if your child sees you sitting in the room during the day - they're likely to think it's playtime.

So, it's best to use Silent Return with Limits to improve napping. 

Another option is using a timer and setting it for a short amount of time - like 15 minutes - and reward them for staying in the room.
Then you can slowly increase the amount of time they stay in there.

If you are still struggling, consider all the principles you learned here - they apply to daytime sleep, too. Giving too much attention, discussion, reminding, reprimanding can all cause kids to keep coming out of their room. So, set nap rules before nap time and then stick to them.